Acetic acid production process

a technology of acetic acid and production process, which is applied in the direction of optical radiation measurement, physical/chemical process catalysts, instruments, etc., can solve the problems of large amount of water (about 14%), increased hydrogen iodide amount, and engineering problems
US20120220801A1Active Publication Date: 2012-08-30LYONDELLBASELL ACETYLS
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
LYONDELLBASELL ACETYLS
Publication Date
2012-08-30

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Abstract

A method for determining the characteristic of one or more components in a step of an acetic acid production process using Raman spectroscopy. The process includes providing a feed stream comprising multiple components to a separations unit, one of the components being acetic acid, the separations unit separating the feed stream into two or more exit streams having a different composition from one another, and measuring a characteristic of one or more of the components by Raman spectroscopic analysis.
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Description

FIELD OF THE INVENTION

[0001] The present disclosure relates to monitoring components in an acetic acid preparation process. More particularly, the present disclosure relates to a method for measuring components by Raman spectroscopy in process steps downstream from an acetic acid reactor. Additionally, the disclosure relates to controlling an acetic acid production process in view of Raman spectroscopy measurements.BACKGROUND OF THE INVENTION

[0002] Acetic acid is commercially produced by methanol carbonylation. Prior to 1970, acetic acid was made using a cobalt catalyst. A rhodium carbonyl iodide catalyst was developed in 1970 by Monsanto. The rhodium catalyst is considerably more active than the cobalt catalyst, which allows lower reaction pressure and temperature. Most importantly, the rhodium catalyst gives high selectivity to acetic acid.

[0003] One problem associated with the original Monsanto process is that a large amount of water (about 14%) is needed to produce hydrogen in the ...

Claims

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